Method for producing a diesel fuel

Abstract

A method relating to oil refining, which can be used to produce low-sulfur diesel fuel, comprising oil demineralization and distillation, and extraction and mixing of diesel fractions, followed by hydrogen refining of the mixture. In an atmospheric tower, two diesel fractions that boil at 171-341° C. and 199-360° C. are extracted. The 199-360° C. fraction is sent for liquid extraction to purify it from benzalkylthiophens. Amide, a product of organic amine interaction with organic acid, is used as the extractant. Fractions are then mixed, maintaining the balance ratio (based on the output) of 171-341° C. and 199-360 ° C. after refining. When refined using the ASTM D-86 method, the mixture of these fractions has an end boiling point no higher than 360° C. The technical result is production of diesel fuel with a 171-360° C. fractional composition and sulfur content of no higher than 10 ppm.

What is claimed: 
     
         1 . A method for production of diesel fuel comprising oil demineralization and distillation, extraction and mixing of diesel fractions followed by hydrogen refining of a mixture, wherein,
 during distillation in an atmospheric tower, two diesel fractions boiling at 171-341° C. and 199-360° C. are extracted,   the 199-360° C. fraction is sent for liquid extraction to purify said 199-360° C. fraction from benzalkylthiophens using amide as an extractant, a product of organic amine interaction with organic acid, and   the 171-341° C. and 199-360° C. fractions are mixed after refining, and wherein a mixture of these fractions, when refined using an ASTM D-86 method, has an end boiling point no higher than 360° C.   
     
     
         2 . The method of  claim 1 , wherein the produced mixture is subject to hydrogen refining on an aluminum-cobalt-molybdenum or aluminum-nickel-molybdenum catalyst.